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UPDATE: Power Solutions for the BMPCC 4K & 6K When Connected to the DJI RS2
I just received the 2 power adapters that I ordered from POWRIG. Both are configured for BMPCC 4K. Here are the main takeaways:
- Only 1 of the 2 units purchased work.
- They seem cheaply made (more on this later).
Operational Notes
Usable Ports (USB-C)
The usable connections on the RS2 are "Image Transmission/Focus Motor Port" and the "Focus Motor Port". The adapter will not provide power via the "RSS Camera Control Port". I have asked the distributor why this is the case, as power from the "RSS Camera Control Port" would be preferable. This would keep the two other ports available for their primary functions (I will update on this, once I hear back from them).
Power-Up Procedure
After spending time testing the power adapter, I discovered that there is only one way to reliably power-up. Simply put, all the connections must be made (dummy battery installed, and USB-C connected to the RS2) prior to switching the BMPCC 4K "ON". I found that anytime I connected either with the power already "ON", the camera would only occasionally power up. For some reason this information (and which USB-C ports are usable) is not mentioned on the distributor's website, nor is there any included documentation.
Conclusion and Options
The Nonoperational Unit
I suspect that this adapter was defective from the factory as it never worked from the start.
Support
After reporting the defective unit to the distributor, I received a prompt reply that included an apology and request for a brief video depicting the problem. Shortly after sending this out I received a reply. I was told that a technician would review the video and get back to me. I was also was immediately offered the choice of refund, or a replacement unit (I opted for a replacement).
Construction
As there was no request to return the defective unit, I decided to open it up to investigate. This was surprising easy, as the housing for the dummy-battery is very thin-walled. So much so, that I was able to break the glue-bond holding it together by simply squeezing near the seams with my fingers. Here's what's inside:
Adapter Construction
There is no power regulation circuitry inside... only a single capacitor (tacked in place with hot glue). I suspect that the BMPCC 4K regulates the input from the battery contacts internally to 7.4 volts. If this were the case, the power adaptor would not need to provide this function. Not being an electronics technician, I don't really understand what the capacitor is providing. Perhaps some form of "power conditioning"?
Black silicone is used through-out to provide mechanical attachment of the wiring, strain-relief to the USB-C cable, insulation to the soldered connections, and to further strengthen the attachment of the capacitor.
It's clearly a cheaply made power solution, but until someone offers an alternate, I'll probably continue using it (with requisite backups on hand).
In any case, having now revealed the internals of the device, I'm guessing that it would be pretty easy for someone to replicate (or improve upon it) if they wanted to.
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